[AS3] How to access child movieclips [movieclip within a movieclip]?

I have made a simple fla that

  • add movieClip1 on the stage
  • moves the movieClip1 from right to left
  • when movieClip1 detects a collision with the mouse, it stops.
  • when mouse is not in-contact, it continues to move left to right.

The problem I am facing now is…
how do I access the movieClip1_child1_animation2

By default, when movieClip1 is added into the stage, it play
movieClip1 -> movieClip1_child1 -> movieClip1_child1_animation1

NOTE: movieClip1_child1 and movieClip_child2 are not dynamically added via class/actionscript, its already inside movieClip1. Same goes with animation1 and animation2 movieclip, both animations are already in the child1 and child2 class.

http://img100.imageshack.us/img100/5065/ayumimovieclipzf5.png